Accessing Switch Keyboard and Mouse Using Scanning or Morse code
Published: Jun 21, 2007A switch may be a possibility for a mobility impaired person unable to use a standard keyboard or mouse. Switches come in a nearly unlimited array and can be controlled with nearly any body part. Even a kick, swipe of the hand, sip and puff by mouth, head movement, eye-blink, touch or physical closeness can activate switches. These switches work in concert with a box or emulator that sends commands for the keyboard and/or mouse to the computer. While switch input may be slow, it allows for independent computer use for some people who could not otherwise access a computer.
A variety of input methods rely on switches. The two most popular are scanning and Morse code. Upon activation of a switch, scanning will bring up a main menu of options on the screen. Additional switch activations allow a drilling down of menu items to the desired keystroke, mouse or menu action. Unlike scanning, Morse code is a more direct method of control and, with practice, can be a very efficient input method.
Switch systems should be mounted with the assistance of a knowledgeable professional, such as an occupational therapist. If mounted to a wheelchair, it is important that switch mounting does not interfere with wheelchair controls. Seating and positioning specialists can also help determine optimum placement for switches and reduce the time in discovering the best switch system.
Source: University of Washington
